import os
import uuid
import logging
from typing import Any, Dict, List, Optional, BinaryIO, Union

from .s3_service import S3Service

logger = logging.getLogger('file_service')


class FileService:
    """文件服务类，处理项目中的文件操作"""

    def __init__(self):
        """初始化文件服务"""
        self.s3_service = S3Service()

    def upload_file(self,
                    file_obj: BinaryIO,
                    original_name: str,
                    file_type: str,
                    project_id: Optional[int] = None,
                    metadata: Optional[Dict[str, str]] = None,
                    public: bool = False) -> Dict[str, Any]:
        """
        上传文件并创建资源记录

        Args:
            file_obj: 文件对象
            original_name: 原始文件名
            file_type: 文件类型 (video, audio, image, etc.)
            project_id: 关联的项目ID
            metadata: 文件元数据
            public: 是否公开访问

        Returns:
            包含文件和资源信息的字典
        """
        # 生成一个唯一的文件名
        _, ext = os.path.splitext(original_name)
        filename = f"{uuid.uuid4()}{ext}".lower()

        # 根据文件类型构建对象键
        object_key = f"{file_type}s/{filename}"
        if project_id:
            object_key = f"projects/{project_id}/{file_type}s/{filename}"

        # 上传文件
        upload_result = self.s3_service.upload_file(
            file_obj=file_obj,
            object_key=object_key,
            metadata=metadata,
            public=public
        )

        logger.info(f"✅ 文件上传成功: {upload_result['object_key']}")

        # 添加文件信息
        upload_result.update({
            'original_name': original_name,
            'filename': filename,
            'file_type': file_type,
            'project_id': project_id
        })

        return upload_result

    def create_asset_from_upload(self, upload_result: Dict[str, Any], user_id: int) -> Any:
        """
        从上传结果创建资源记录

        Args:
            upload_result: 上传结果字典
            user_id: 用户ID

        Returns:
            创建的资源记录
        """
        # TODO: 实现创建资源记录的代码
        # 这里假设已经有一个资源模型和创建方法
        # from database_service import DatabaseService
        # db_service = DatabaseService()
        # return db_service.create_asset({
        #    'filename': upload_result['filename'],
        #    'original_name': upload_result['original_name'],
        #    'file_path': upload_result['object_key'],
        #    'type': upload_result['file_type'],
        #    'download_url': upload_result['file_url'],
        #    'project_id': upload_result.get('project_id'),
        #    'user_id': user_id
        # })
        pass

    def delete_file(self, object_key: str) -> bool:
        """
        删除文件

        Args:
            object_key: 对象键/文件路径

        Returns:
            是否删除成功
        """
        return self.s3_service.delete_file(object_key)

    def get_file_url(self, object_key: str, public: bool = False, expires_in: int = 0) -> str:
        """
        获取文件URL

        Args:
            object_key: 对象键/文件路径
            public: 是否公开访问
            expires_in: URL有效期（秒）

        Returns:
            文件URL
        """
        return self.s3_service.get_file_url(object_key, public, expires_in)
